Some time was spent to understand how to work with audio players. I think I understand it now.
But First of all I have worked on icon and app structure. Before, it was generic icon and window, pressing any icon would show same Window, but now, I can actually press different Icons, each represents one app. Unfortunately, I dont know how to apply animation on close of window now, since I dont change class of it anymore, I delete it from list of open windows. Added 3 songs Sinking Town, Chicago and Charlie’s Inferno. To be honest, it becomes actually interesting when you understand and can do it. I loved this part of doing player, though I didn’t finish it yet.